Some 1,500 runners will compete in the Seven Mile Bridge Run on Saturday morning.

Monroe County Sheriff’s officials say the bridge will be closed to motorized vehicles between 6:45 a.m. and 9 a.m.

The event began in 1982 to celebrate the conclusion of a federally funded program that built a new Seven Mile Bridge and 36 other Keys spans. The contest was so well received local leaders decided to continue it.

This year’s race sold out within 10 minutes after online registration opened.